When you have connected (Instruction) your iPhone with your Apple Watch, you can install the NAVIGON app by tapping on the NAVIGON app within the Apple Watch app and set it on "Active".
Now you are able to start the NAVIGON app on your iPhone and also on your Apple Watch.
As long as you haven't started an active navigation, you will see the standard screen on your Apple Watch.
When you have started an active navigation, you will also see the navigation instructions on your Apple Watch.
Please be aware that your Apple Watch is going into a stand-by modus after a few seconds. To see the current navigation instructions, you have to unlock your Apple Watch via the buttons or the display.
Examples of warning signs: